Ironfinger can be found being rallied by Kressa Bonedaughter along with her fellow cultists Hairy Henry and Maghtew Budj. If the party waits too long before approaching, Kressa's speech will give her and the cultists 10 temporary hitpoints through a buff called Myrkul's Gift. She will attack along with the other followers in the Barracks if the party initiates combat through dialogue with Kressa or if attacked. If left alone, she will move to her room in the north-west part of the Barracks and begin practicing on a training dummy. She will say "The end is coming—do you feel it?" and "We are fortunate to live in the end-times. Pray with me" when spoken to.
Her notes indicate she lives in fear of her leader Kressa, who has become obsessed with tadpole experimentation, and suspects she might one day infect her with one as she sleeps. The two used to practice necromancy on ants back when they were younger.
When you are about to be hit by an enemy, use your Reaction to increase your Armour Class by 5. You also take no damage from Magic Missile. These effects last until the start of your next turn.